SP3243EBCA-L-TR Datasheet, PDF (14/25 Pages) Exar Corporation – 3 Driver/5 Receiver Intelligent +3.0V to +5.5V RS-232 Transceivers

6
4
2
Vout+
Vout-
0
-2
-4
-6
Load Current Per Transmitter [mA]
The SP3243E driver outputs are able to maintain
voltage under loading of up to 2.5mA per driver,
ensuring sufficient output for mouse-driving ap-
plications.
0
VOUT +
0
1
VOUT _-
Figure 19. SP3243E Driver Output Voltages vs. Load
Current per Transmitter
VCC
+
C5 0.1 µF
+
28 _C1+
C1 0.1 µF
24 C1-
1 C2+
+
C2 0.1 µF
2 C2-
14 ^T1^IN
13 ^T2^IN
12 ^T3^IN
26
VCC
V+ ²⁷
+
C3 0.1 µF
SP3243E _V- 3
T₁OUT ₉
T₂OUT ₁₀
T₃OUT ₁₁
C4 0.1 µF
+
VCC
To µP Supervisor
Circuit
20 ^R2^OUT
19 ^R1^OUT
R₁IN ₄
18 ^R2^OUT
5k Ω
R₂IN ₅
17 ^R3^OUT
5k Ω
R₃IN ₆
16 ^R4^OUT
5k Ω
R₄IN ₇
15 ^R5^OUT
5k Ω
R₅IN ₈
22 _SHUTDOWN
5k Ω
23 _ONLINE
21 _STATUS
GND
25
DB-9 Connector Pins:
1. Received Line Signal Detector
2. Received Data
3. Transmitted Data
4. Data Terminal Ready
5. Signal Ground (Common)
6. DCE Ready
7. Request to Send
8. Clear to Send
9. Ring Indicator
DB-9
Connector
6
7
8
9
1
2
3
4
5
Figure 20. Circuit for the connectivity of the SP3243E with a DB-9 connector
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
14
SP3243E_102_060611